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Linear Technology Electronic Components Datasheet

LTC3899MPUHF Datasheet

Buck/Buck/Boost Synchronous Controller

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LTC3899
FEATURES
60V Low IQ, Triple
Output, Buck/Buck/Boost
Synchronous Controller
DESCRIPTION
n Dual Buck Plus Single Boost Synchronous Controllers
n Wide Bias Input Voltage Range: 4.5V to 60V
n Outputs Remain in Regulation Through Cold Crank
Down to a 2.2V Input Supply Voltage
n Buck and Boost Output Voltages Up to 60V
n Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
n No External Bootstrap Diodes Required
n Low Operating IQ: 29μA (One Channel On)
n 100% Duty Cycle for Boost Synchronous MOSFET
n Phase-Lockable Frequency (75kHz to 850kHz)
n Programmable Fixed Frequency (50kHz to 900kHz)
n Very Low Dropout Operation: 99% Duty Cycle (Bucks)
n Low Shutdown IQ: 3.6μA
n Fixed or Adjustable Boost Output Voltage Saves IQ
n Small 38-Lead 5mm × 7mm QFN and TSSOP Packages
APPLICATIONS
n Automotive Always-On and Start-Stop Systems
n Distributed DC Power Systems
n Multioutput Buck-Boost Applications
The LTC®3899 is a high performance triple output (buck/
buck/boost) DC/DC switching regulator controller that
drives all N-channel synchronous power MOSFET stages.
The constant frequency current mode architecture allows
a phase-lockable frequency of up to 850kHz. The LTC3899
operates from a wide 4.5V to 60V input supply range.
When biased from the output of the boost converter or
another auxiliary supply, the LTC3899 can operate from
an input supply as low as 2.2V after start-up.
The gate drive for the LTC3899 can be programmed from
5V to 10V to allow the use of logic-level or standard-level
FETs and to maximize efficiency. Internal switches in the
top gate drivers eliminate the need for external bootstrap
diodes. The 29μA no-load quiescent current extends op-
erating run time in battery-powered systems. OPTI-LOOP®
compensation allows the transient response to be optimized
over a wide range of output capacitance and ESR values.
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620,
6144194, 6177787, 6580258.
TYPICAL APPLICATION
High Efficiency Wide Input Range Dual 5V/8.5V Converter
VOUT3
REGULATED AT 10V
WHEN VIN < 10V
FOLLOWS VIN WHEN
VIN > 10V
33µF
VIN
2.2V TO 60V
(START-UP
ABOVE 5V)
3mΩ 1.2µH
33µF
4.7µF
RUN1, 2, 3 VBIAS
VFB3
TG1
0.1µF
0.1µF
TG3
BOOST1
SW1
BOOST3
SW3
BG1
LTC3899
BG3
SENSE1+
SENSE1
SENSE3
SENSE3+
VFB1
DRVCC
INTVCC
0.1µF
TG2
0.1µF
ITH1,2,3 BOOST2
SW2
BG2
DRVSET
SENSE2+
SENSE2
VPRG3
VFB2
GND
4.9µH 9mΩ
VOUT1
5V
5A
357k
68.1k
220µF
6.5µH 15mΩ
VOUT2
8.5V
3A
649k
68.1k
68µF
3899 TA01a
For more information www.linear.com/LTC3899
Efficiency vs Output Current
95
VIN = 12V
94
VOUT = 5V
Burst Mode OPERATION
93
92
91
90
89
88
0.01
GATE DRIVE (DRVCC)
5V
6V
8V
10V
0.1
1
OUTPUT CURRENT(A)
10
3899 TA01b
3899fa
1


Linear Technology Electronic Components Datasheet

LTC3899MPUHF Datasheet

Buck/Buck/Boost Synchronous Controller

No Preview Available !

LTC3899
ABSOLUTE MAXIMUM RATINGS (Notes 1, 3)
Bias Input Supply Voltage (VBIAS)............... –0.3V to 65V
Topside Driver Voltages
BOOST1, BOOST2, BOOST3................... –0.3V to 76V
Switch Voltage (SW1, SW2, SW3)................. –5V to 70V
DRVCC, (BOOST1-SW1), (BOOST2-SW2),
(BOOST3-SW3)............................................–0.3V to 11V
BG1, BG2, BG3, TG1, TG2, TG3........................... (Note 8)
RUN1, RUN2, RUN3 Voltages...................... –0.3V to 65V
SENSE1+, SENSE2+, SENSE1
SENSE2Voltages...................................... –0.3V to 65V
SENSE3+, SENSE3Voltages...................... –0.3V to 65V
PLLIN/MODE, FREQ, DRVSET Voltages........ –0.3V to 6V
EXTVCC Voltage.......................................... –0.3V to 14V
ITH1, ITH2, ITH3, VFB1, VFB2 Voltages.......... –0.3V to 6V
VFB3 Voltage............................................... –0.3V to 65V
VPRG3, Voltage............................................ –0.3V to 6V
TRACK/SS1, TRACK/SS2, SS3 Voltages....... –0.3V to 6V
Operating Junction Temperature Range (Note 2)
LTC3899E, LTC3899I.......................... –40°C to 125°C
LTC3899H........................................... –40°C to 150°C
LTC3899MP........................................ –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
ITH1 1
VFB1 2
SENSE1+ 3
SENSE14
FREQ 5
PLLIN/MODE 6
SS3 7
SENSE3+ 8
SENSE39
VFB3 10
ITH3 11
INTVCC 12
RUN1 13
RUN2 14
RUN3 15
SENSE216
SENSE2+ 17
VFB2 18
ITH2 19
TOP VIEW
39
GND
38 VPRG3
37 TRACK/SS1
36 TG1
35 SW1
34 BOOST1
33 BG1
32 SW3
31 TG3
30 BOOST3
29 BG3
28 VBIAS
27 EXTVCC
26 DRVCC
25 BG2
24 BOOST2
23 SW2
22 TG2
21 TRACK/SS2
20 DRVSET
FE PACKAGE
38-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 25°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
FREQ 1
PLLIN/MODE 2
SS3 3
SENSE3+ 4
SENSE35
VFB3 6
ITH3 7
INTVCC 8
RUN1 9
RUN2 10
RUN3 11
SENSE212
38 37 36 35 34 33 32
39
GND
13 14 15 16 17 18 19
31 SW1
30 BOOST1
29 BG1
28 SW3
27 TG3
26 BOOST3
25 BG3
24 VBIAS
23 EXTVCC
22 DRVCC
21 BG2
20 BOOST2
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
TJMAX = 150°C, θJA = 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
3899fa
2
For more information www.linear.com/LTC3899


Part Number LTC3899MPUHF
Description Buck/Buck/Boost Synchronous Controller
Maker Linear Technology
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